Supply air terminal device

ABSTRACT

The invention concerns a supply air terminal device ( 10 ), which includes a supply air chamber ( 11 ) and therein nozzles ( 12   a   1,    12   a   2  . . . ), through which supply air is conducted into an internal side chamber (B 1 ) of the device. In the device solution, the supply airflow (L 1 ) induces a circulated airflow, that is a secondary airflow (L 2 ), from the room space (H 1 ) to flow through a heat exchanger ( 13 ) of the device into the side chamber (B 1 ) to join the supply airflow (L 1 ). In the device solution, the combined airflow (L 1 +L 2 ) of supply air and circulated air is made to flow sideways from the device. The central axes (X 1 ) of the nozzles ( 12   a   1,    12   a   2  . . . ) of the supply air chamber ( 11 ) are at an oblique angle (α) in relation to the vertical axis (y 1 ) of the device, whereby the supply airflow from the supply air chamber ( 11 ) is conducted obliquely from the nozzles towards a wall ( 14 ) limiting the side chamber (B 1 ), whereby the combined airflow (L 1 +L 2 ) of supply airflow (L 1 ) and circulated airflow (L 2 ) is conducted sideways from the device.

FIELD OF THE INVENTION

[0001] The invention concerns a supply air terminal device, which is used for conducting a mixture of primary air and circulated air into the room space. The primary air, preferably fresh supply air, is first conducted into the supply air chamber of the device and thence through nozzles into a mixing chamber. The primary airflow is used to induce a secondary airflow, that is, a flow of re-circulated air, from the room space. In the device solution, the secondary airflow and the primary airflow are combined in the mixing chamber, and the combined airflow is made to flow away from the device.

BACKGROUND OF THE INVENTION

[0002] So-called closed and open state-of-the-art supply air terminal devices are known. The so-called closed supply air terminal device is open from the bottom part of the device, whereby the re-circulated airflow L₂ is conducted below through the heat exchanger of the device into the mixing chamber. The said airflow is induced by supply airflow L₁ from the nozzles of the supply air chamber. From the mixing chamber, the combined airflow L₁+L₂ is made to flow out and preferably sideways guided by flow-guiding plates.

[0003] Where the circulated airflow is cooled, directing of the airflow leaving the device has become a problem. In state-of-the-art solutions, the combined airflow L₁+L₂ tends to leave the device downwards, although the aim is to direct the combined airflow L₁+L₂ to the side horizontally and preferably at ceiling level.

OBJECTS AND SUMMARY OF THE INVENTION

[0004] In order to overcome the above-mentioned problem, in the solution according to the invention the supply airflow is directed from the nozzles of the supply air chamber in such a way that the flow meets obliquely an internal wall limiting the mixing chamber B₁, which wall is located close to the heat exchanger. Thus, the central axes of the nozzles are obliquely at an angle α in relation to the vertical axis y₁ of the device. The angle range α is preferably between 5° and 15°, that is, 5°≦α≦15°. With the described directing of the nozzles a desired throw pattern is achieved for the combined airflow L₁+L₂.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] In the following, the invention will be described with reference to some advantageous embodiments of the invention shown in the figures of the appended drawings, but the intention is not to limit the invention to these embodiments only.

[0006]FIG. 1A is a cross-sectional view of a state-of-the-art device solution. The problem area occurring in the state-of-the-art solution is described based on the figure.

[0007]FIG. 1B shows a solution to the problem shown in FIG. 1A.

[0008]FIG. 2A is an axonometric view of the supply air terminal device according to the invention.

[0009]FIG. 2B is a cross-section along line I-I of FIG. 1A.

DETAILED DESCRIPTION OF THE INVENTION

[0010]FIG. 1A shows a state-of-the-art supply air terminal device 10. From the supply air terminal device 10 fresh supply air is made to flow into a side chamber or mixing chamber B₁ from nozzles 12 a ₁, 12 a ₂ . . . The said airflow L₁ pulls along a circulated airflow L₂ from room space H₁ through heat exchanger 13. In heat exchanger 13 the said circulated air L₂ is either cooled or heated. In case of cooling it has become a problem that the combined airflow L₁+L₂ is in a direction downwards and not sideways from the device, as it should. In the embodiment shown in FIG. 1A, the nozzles 12 a ₁, 12 a ₂ . . . direct the supply airflow, that is, the primary airflow L₁, directly downwards. Hereby the combined airflow L₁+L₂ is also directed downwards from discharge opening 30.

[0011]FIG. 1B shows a solution to the problem according to FIG. 1A. As is shown in the figure, the central axes X₁ of nozzles 12 a ₁, 12 a ₂ . . . are at an oblique angle α in relation to vertical axis y₁. Angle α is in a range of 5°-15°, that is, 5°≦α≦15°. In the figures, the central vertical axis of the device is indicated by Y₁ , and the parallel vertical axis is indicated by y₁. In addition, nozzles 12 a ₁, 12 a ₂ . . . are directed in such a way obliquely in relation to vertical axis y₁ , that the air L₁ made to flow from them into the mixing chamber is directed towards the central part of the device and obliquely towards wall 14, which wall 14 functions as one side wall of side chamber B₁. By the oblique mounting of nozzles 12 a ₁, 12 a ₂ . . . according to the invention the supply airflow L₁ is directed to flow in parallel with side wall 14, whereby the flow clings to side wall 14 and flows partly under the coanda effect along the surface of side wall 14 downwards, and guided by the said side wall structure it will leave the device through discharge opening 30. The supply airflow L₁ induces the circulated airflow L₂ to follow it and thus the combined airflow L₁+L₂ is made to flow out of the device sideways and horizontally.

[0012]FIG. 2A is an axonometric view of the supply air terminal device according to the invention and it is cut open in part to show the internal components of the device. Supply air terminal device 10 is a so-called closed structure, whereby it includes flow paths into the device for the circulated airflow L₂ as the figure shows below the device and flow paths for the combined airflow L₁+L₂ leaving the device also below the device. The device includes side plates 10 a ₁, 10 a ₂ and end plates 10 b ₁, 10 b ₂ as well as a covering plate 10 c. Plate 10 c limits the supply air chamber 11 at the top. The air is conducted from the supply air channel (not shown) into supply air chamber 11. From supply air chamber 11 the air is made to flow as the arrows L₁ indicate through nozzles 12 a ₁, 12 a ₂ . . . into side chamber or mixing chamber B₁. The device is symmetrical in relation to the central vertical axis Y₁. There are two side chambers B₁, and the combined airflow L₁+L₂ is discharged to two sides from the device.

[0013] As is shown in FIG. 2B, the supply airflow L₁ is conducted from supply air chamber 11 through nozzles 12 a ₁, 12 a ₂ . . . in such a way that the supply airflow L₁ is directed towards the vertical central axis Y₁ of the device and thus towards the inner wall 14 of side chamber B₁. As is shown in the figure, each side chamber B₁ is limited by a wall 14 beside heat exchanger 13, by a side wall 10 b ₁ and at the top by the bottom 11 a of supply air chamber 11. In addition, each side chamber B₁ is limited at the ends by end plates 10 b ₂, 10 b ₂. The circulated airflow, that is, the secondary airflow L₂, travels induced by the primary airflow, that is, by the supply airflow L₁, from room space H₁ through a central supply opening 20 and through heat exchanger 13 to join the supply airflow L₁ in side chamber B₁. Flows L₁+L₂ are combined in side chamber B₁, and the combined airflow L₁+L₂ leaves side chamber B₁ guided by the lower guiding flap 14 a ₁ of wall 14 and by wall section 10 a ₁′ located obliquely in relation to the lower vertical axis Y₁ of side plate 10 a ₁. Thus, the combined airflow L₁+L₂ is made to flow sideways from the device in the direction of ceiling K level. The device structure is symmetrical in relation to vertical central axis Y₁, and the airflow arrangement is similar at the other side of the device.

[0014] According to the invention, a heat exchanger 13 is used to heat or cool the circulated airflow L₂. If the circulated airflow L₂ is heated, heat is transferred from the heat transfer material of heat exchanger 13 into the circulated airflow L₂, and if heated, the heat energy is transferred from the circulated airflow into the heat transfer material and away from the device.

[0015] With the aid of walls 14 the device is divided into two structural sections; into a first central section, wherein heat exchanger 13 is located, and into two other sections, wherein a side or mixing chamber B₁ , is formed. The circulated airflow L₂ is conducted through the supply opening 20 of the first central section to the central heat exchanger 13 of the device and from heat exchanger 13 into side chamber B₁. The supply airflow L₁ is conducted into side chamber B₁ from supply air chamber 11 through its nozzles 12 a ₁, 12 a ₂ . . . The airflows L₁ and L₂ are combined in side chamber B₁. Thus, the separating wall 14 functions both as a structure supporting and mounting the heat exchanger and also as a dividing structural component, which is used to direct the circulated airflow L₂ first through heat exchanger 13 and to separate side chamber B₁ from the remaining structure. According to the invention, the supply airflow L₁ is directed obliquely towards wall 14. The said direction is advantageous for the flow L₁+L₂ leaving the device. The combined airflow L₁+L₂ can be directed sideways away from the supply air terminal device 10.

[0016] In the internal wall 14 limiting side chamber B₁ the device according to the invention includes a guiding flap 14 a ₁, which includes a flap section 14 a ₁′, which is positioned obliquely in relation to vertical axis y₁. With flap section 14 a ₁′ an end flap section 14 a ₁″ is joined, which is at right angles to vertical axis y₁. With the aid of the mentioned flow-guiding structure, the combined airflow L₁+L₂ is directed sideways from the device 10 through discharge opening 30.

[0017] As is shown in the figure, the central axes X₁ of nozzles 12 a ₁, 12 a ₂ . . . are directed in such a way that the angle α between the central axis X₁ of the nozzles and the vertical axis y₁ is in a range of 5°-15°, that is, 5°≦α≦15°, and the said central axis X₁ is directed towards the central wall 14, the so-called separating wall 14, of side chamber B₁. Hereby the supply airflow L₁ from nozzles 12 a ₁, 12 a ₂ . . . is directed obliquely towards wall 14, and the combined airflow L₁+L₂ is directed horizontally sideways from the device. 

We claim:
 1. Supply air terminal device (10), comprising: a supply air chamber (11) and therein nozzles (12 a ₁, 12 a ₂ . . . ), through which supply air is conducted into an internal side chamber (B₁) of the device, and that in the device solution the supply airflow (L₁) induces a circulated or secondary airflow (L₂) from the room space (H₁) to flow through the heat exchanger (13) of the device into the side chamber (B₁) to join the supply airflow (L₁), and in which device solution the combined airflow (L₁+L₂) of supply air and circulated air is made to flow sideways from the device, wherein the nozzles (12 a ₁, 12 a ₂ . . . ) of the supply air chamber (11) have central axes (X₁), which are at an oblique angle (α) in relation to the vertical axis (y₁) of the device, whereby the supply airflow from the supply air chamber (11) is conducted obliquely from the nozzles towards a wall (14) limiting the side chamber (B₁), whereby the combined airflow (L₁+L₂) of supply airflow (L₁) and circulated airflow (L₂) is conducted sideways from the device.
 2. Supply air terminal device according to claim 1, wherein the supply air chamber (11) is located in between side plates (10 a ₁, 10 a ₂) and that the device includes end plates (10 b ₁, 10 b ₂) and internal walls (14), in between which walls (14) a heat exchanger (13) is located, whereby the circulated airflow (L₂) flows between the walls (14) to the heat exchanger (13) and further into side chamber (B₁) between side plate (10 a ₁) and wall (14) induced by the supply airflow (L₁) conducted thereto.
 3. Supply air terminal device according to claim 2, wherein the wall (14) includes a flap section (14 a ₁′) and joined thereto an end flap section (14 a ₁″), whereby the flap section (14 a ₁′) is in an oblique position in relation to vertical axis (y₁) and the end flap section (14 a ₁″) is at right angles to vertical axis (y₁), whereby the above-mentioned structure functions to guide the combined airflow (L₁+L₂) sideways.
 4. Supply air terminal device according to claim 1, wherein angle α is within a range of 5°≦α≦15°.
 5. A supply air terminal device, comprising: a supply air chamber (11) having at least one nozzle (12 a ₁); supply airflow (L₁) flowing from said a supply air chamber (11) to an internal side chamber (B₁) of said supply air terminal device said supply airflow (L₁) induces a secondary circulated airflow (L₂) to flow from a room space through a heat exchanger (13) into said side chamber (B₁) then joining said supply airflow (L₁) creating a combined airflow (L₁+L₂) of said supply airflow (L₁) and said circulated airflow (L₂), said combined airflow then flowing sideways from said supply air terminal device (L₁+L₂); wherein said nozzles of said supply air chamber have central axes (X₁), said central axes are at an oblique angle to a vertical axis (y₁) of said supply air terminal device, said supply airflow from said supply air chamber (11) being conducted obliquely form said nozzles towards a wall (14) limiting said side chamber (B₁), whereby said combined airflow (L₁+L₂) is conducted sideways from said supply air terminal device.
 6. A supply air terminal device according to claim 1, further comprising: a first side plate (10 a ₁), a second side plate (10 a ₂), a first end plate (10 b ₁), a second end plate (10 b ₂) and internal walls (14), said supply air chamber (11) disposed between said a first side plate (10 a ₁) and said a second side plate (10 a ₂) wherein a heat exchanger is arranged between said internal walls (14), whereby said circulated airflow (L₂) flows from between said walls (14) to said heat exchanger (13) and said circulated airflow (L₂) continues to flow into said side chamber (B₁) between said first side plate and said wall (14) being exerted on by said supply airflow (L₁).
 7. A supply air terminal device according to claim 2, wherein the wall (14) includes a flap section (14 a ₁′) having an end flap section (14 a ₁″), said end flap (14 a ₁″) section being in an oblique position relative to the vertical axis (y₁) and said end flap section (14 a ₁″) being at approximate right angles to the vertical axis (y₁) thereby guiding the combined airflow sideways.
 8. A supply air terminal device according to claim 2, wherein angle (α) is between about 5° and about 15°. 